American Airlines: Latest on Philadelphia airport blackout that led to major delays

Computer problems Wednesday morning forced American Airlines to ground all flights and required passengers to be manually checked in to their flights at Philadelphia International Airport, local television station KYW and the Associated Press reported.

The computer system is back up and the ground stop preventing American Airlines flights to and from Philadelphia International Airport has been lifted, according a tweet posted by the airport.

Ground stop is canceled for @AmericanAir flights departing to PHL. American computers at PHL are running again.

American Airlines spokesperson Katie Cody told the Associated Press the issue began after American Airlines planned an internet outage overnight and the airline's system didn't come back up at the Philadelphia airport. A statement released by American Airlines said the computer system failed to come back online at 4 a.m. as planned. No other airports or airlines were affected by the outage.

@SteveLindsayCBS

The computer issues caused hourslong delays. CBS reported that some passengers waited in line for hours overnight and an elderly man reportedly became lightheaded and was put in a wheelchair while waiting in a delayed line.

Flyers &amp; police help elderly man into a wheelchair after he became lightheaded waiting in delayed @AmericanAir line @PHLAirport @CBSPhilly https://t.co/L6biIFLqYb

Although the computer system is back up and the ground stop has been lifted, lingering delays are anticipated as operations resume, Philly.com reported. It's not known what caused the computer issues.